LXR linux/arch/arm/mach-tegra/tegra20

   1/*
   2 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   3 *
   4 * This program is free software; you can redistribute it and/or modify it
   5 * under the terms and conditions of the GNU General Public License,
   6 * version 2, as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope it will be useful, but WITHOUT
   9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11 * more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16
  17#include <linux/kernel.h>
  18#include <linux/bug.h>
  19
  20#include "fuse.h"
  21
  22#define CPU_SPEEDO_LSBIT                20
  23#define CPU_SPEEDO_MSBIT                29
  24#define CPU_SPEEDO_REDUND_LSBIT         30
  25#define CPU_SPEEDO_REDUND_MSBIT         39
  26#define CPU_SPEEDO_REDUND_OFFS  (CPU_SPEEDO_REDUND_MSBIT - CPU_SPEEDO_MSBIT)
  27
  28#define CORE_SPEEDO_LSBIT               40
  29#define CORE_SPEEDO_MSBIT               47
  30#define CORE_SPEEDO_REDUND_LSBIT        48
  31#define CORE_SPEEDO_REDUND_MSBIT        55
  32#define CORE_SPEEDO_REDUND_OFFS (CORE_SPEEDO_REDUND_MSBIT - CORE_SPEEDO_MSBIT)
  33
  34#define SPEEDO_MULT                     4
  35
  36#define PROCESS_CORNERS_NUM             4
  37
  38#define SPEEDO_ID_SELECT_0(rev)         ((rev) <= 2)
  39#define SPEEDO_ID_SELECT_1(sku)         \
  40        (((sku) != 20) && ((sku) != 23) && ((sku) != 24) && \
  41         ((sku) != 27) && ((sku) != 28))
  42
  43enum {
  44        SPEEDO_ID_0,
  45        SPEEDO_ID_1,
  46        SPEEDO_ID_2,
  47        SPEEDO_ID_COUNT,
  48};
  49
  50static const u32 cpu_process_speedos[][PROCESS_CORNERS_NUM] = {
  51        {315, 366, 420, UINT_MAX},
  52        {303, 368, 419, UINT_MAX},
  53        {316, 331, 383, UINT_MAX},
  54};
  55
  56static const u32 core_process_speedos[][PROCESS_CORNERS_NUM] = {
  57        {165, 195, 224, UINT_MAX},
  58        {165, 195, 224, UINT_MAX},
  59        {165, 195, 224, UINT_MAX},
  60};
  61
  62void tegra20_init_speedo_data(void)
  63{
  64        u32 reg;
  65        u32 val;
  66        int i;
  67
  68        BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) != SPEEDO_ID_COUNT);
  69        BUILD_BUG_ON(ARRAY_SIZE(core_process_speedos) != SPEEDO_ID_COUNT);
  70
  71        if (SPEEDO_ID_SELECT_0(tegra_revision))
  72                tegra_soc_speedo_id = SPEEDO_ID_0;
  73        else if (SPEEDO_ID_SELECT_1(tegra_sku_id))
  74                tegra_soc_speedo_id = SPEEDO_ID_1;
  75        else
  76                tegra_soc_speedo_id = SPEEDO_ID_2;
  77
  78        val = 0;
  79        for (i = CPU_SPEEDO_MSBIT; i >= CPU_SPEEDO_LSBIT; i--) {
  80                reg = tegra_spare_fuse(i) |
  81                        tegra_spare_fuse(i + CPU_SPEEDO_REDUND_OFFS);
  82                val = (val << 1) | (reg & 0x1);
  83        }
  84        val = val * SPEEDO_MULT;
  85        pr_debug("%s CPU speedo value %u\n", __func__, val);
  86
  87        for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
  88                if (val <= cpu_process_speedos[tegra_soc_speedo_id][i])
  89                        break;
  90        }
  91        tegra_cpu_process_id = i;
  92
  93        val = 0;
  94        for (i = CORE_SPEEDO_MSBIT; i >= CORE_SPEEDO_LSBIT; i--) {
  95                reg = tegra_spare_fuse(i) |
  96                        tegra_spare_fuse(i + CORE_SPEEDO_REDUND_OFFS);
  97                val = (val << 1) | (reg & 0x1);
  98        }
  99        val = val * SPEEDO_MULT;
 100        pr_debug("%s Core speedo value %u\n", __func__, val);
 101
 102        for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
 103                if (val <= core_process_speedos[tegra_soc_speedo_id][i])
 104                        break;
 105        }
 106        tegra_core_process_id = i;
 107
 108        pr_info("Tegra20 Soc Speedo ID %d", tegra_soc_speedo_id);
 109}
 110